1. The problem statement, all variables and given/known data A .20 kg hockey puck is launched up a metal ramp that is inclined at a 30.0 degree angle. The coefficients of static and kinetic friction between the hockey puck and the metal ramp are Ms= .40 kg and Mk=.30 kg , respectively. The puck's initial speed is 35.0 m/s. What is the magnitude of the acceleration of the puck on the ramp? 2. Relevant equations F= ma 3. The attempt at a solution N= Nj Fgrav= mg(cos 30- sin 30) Friction= MkN In the j direction the forces are: N-mgsin(30)=0 N= -1.94 In the i direction the forces are: mgcos(30) + MkN=ma a= (mgcos(30)+ MkN)/ m =a then when I plug in all of the given numbers I get -1.4. I have tried this problem a bunch of times and cannot get anywhere close to the correct answer. What am I doing wrong?